JPH0439B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head lifting and lowering support device for a rail type universal parallel ruler.

As shown in Japanese Patent Publication No. 51-39128, this type of device has a
A means is provided for changing the head holding force at an intermediate position between the position where the lowest surface of the head contacts the drawing surface and the highest floating position of the head, and when the head is above the intermediate position. The lowermost surface of the head can be completely held in the floating position, and when the head is below the intermediate position, the lowermost surface of the head can be brought into close contact with the drawing surface by its own weight. It is publicly known.

In the case of the above configuration, there was a problem in that if a downward external stress was carelessly applied to the head while the head was held in the raised position, the head would fall and collide with the drawing surface. .

Additionally, there is a device of this type that is configured to lock the head in the raised position, but in the case of this device, if a downward load is applied to the head while the head is locked in the raised position, this load There was a risk that the elevating links that supported the head would be destroyed because it would not be possible to escape.

The present invention aims to eliminate the above-mentioned defects.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

2 is a drawing board, which is roughly horizontal to the floor.
It is supported on a known drafting table so that any angle can be set between it and the 60-degree upright position. An X rail 4 is fixed to the upper edge of the drawing board, and the X rail 4
A Y-rail 6 is movably mounted in a perpendicular relationship to. 8 is a Y cursor movably attached to the Y rail 6 via rollers,
A head 12 is attached to this via a head lifting/lowering support device 10 so as to be able to rise and fall freely while maintaining the head 12 substantially parallel to the two surfaces of the drawing board. A horizontal ruler 16 and a vertical ruler 18 are mounted on the ruler mounting plate 14 of the head 12.
is installed.

Next, the structure of the head elevating support device 10 will be explained with reference to FIGS. 2 and 4.

20, 22 are links, to which bearing members 24, 26, 28, 30 are fixed, and both pivot-shaped ends of shaft bodies 32, 34 are rotatably fitted into each of the bearing members. . The shaft body 32 is fixed to a support body 36. The support body 36 is Y
It is fixed to an L-shaped mounting plate 38 that is removably fixed to the cursor 8 with a screw. The shaft body 3
4 are both side plate portions 40a of the head support plate 40.
It is rotatably fitted into a transparent hole. 42 is a connecting member, and a pair of protrusions 42a, 42b integrally formed therein are rotatably connected to the links 20, 22 by threaded rods 44, 46. A tube portion is formed in the upper plate portion of the connecting member 42, and a rotating body 48 is rotatably fitted into the tube portion. A displacement body manual operation member 50 consisting of a lever is fixed to the upper part of the rotating body 48, and a displacement body 52 consisting of a cylindrical cam in which a steeply sloped spring engagement part 53 is formed is fixed to the lower part. 54 is a spring made of a coil spring rotatably wound around the shaft body 32, and one end of this spring is connected to the screw 55.
is fixedly engaged with the support body 36 by. The other end of the spring 54 is slidably fitted into a groove-shaped spring engaging portion 53 formed in the displacement body 52.
The spring engaging portion 53 is formed with an inclined portion 54a, an upper horizontal portion 54b, and a lower horizontal portion 54c. Reference numeral 56 denotes a link, one end of which is rotatably supported by a shaft 58 on the protrusion of the support 36, and the other end of the link 56 is a lower part of the link 60 whose upper part is rotatably connected to the shaft 34. , the axis 6 can be rotated freely.
It is supported by two. The links 20, 22, 56 and 60 constitute a lifting guide mechanism. 70 is a vertical hole transparently provided in the head support plate 40, and an adjustment shaft 72 is slidably inserted into the large diameter portion of the vertical hole 70, and the threaded portion of the adjustment shaft 72 is connected to the threaded portion of the small diameter portion of the vertical hole 70. are screwed together. The lower end of the adjustment shaft 72 is in contact with the upper surface of the protrusion 60a of the link 60. A slot for a driver is formed in the flange of the adjustment shaft 72, and the flange is biased upward by a coil spring 74. A cap screw 76 is screwed into a screw hole adjacent to the vertical hole 70 to prevent the adjustment shaft 72 from coming off. The head 12 is supported on the head support plate 40. 8
Reference numerals 0 and 82 indicate stoppers protruding from the connecting member 42, and protrusions 50a are fixed to the member 50 in correspondence with the stoppers 80 and 82. When the member 50 is swung by a predetermined angle in the counterclockwise rotation direction in FIG. 4, the protrusion 50a comes into contact with the stopper 82.
At this time, the displacement body 52 rotates in the counterclockwise direction in conjunction with the member 50. In this state, the upper portion 52b of the spring engaging portion 53 abuts and engages with the other spring 54. That is, the engagement position of the spring engaging portion 53 of the displacement body 52 with the spring 54 is retracted upward by a predetermined amount as the displacement body 52 rotates in one direction. When the member 50 is swung by a predetermined angle in the direction of rotation of the hour hand in FIG. 4, the protrusion 50a comes into contact with the stopper 80. At this time, the displacement body 52 rotates in the clockwise direction in conjunction with the member 50. In this state, the lower portion 52 of the spring engaging portion 53 of the displacement body 52
a is abuttingly engaged with the other of the springs 54. That is,
The engagement position of the spring engaging portion 53 of the displacement body 52 with the spring 54 protrudes downward by a predetermined amount as the displacement body 52 rotates in the other direction. With the drawing board 2 set horizontally to the floor surface, that is, in a state where the load of the head 12 is the largest on the surface of the drawing board 2, the member 50 is rotated until the protrusion 50a abuts the stopper 80. However, when the lower portion 52a of the spring engaging portion 53 of the displacement body 52 is engaged with the other spring 54, the engagement position of the spring engaging portion 53 of the displacement body 52 with the spring 54 is moved downward by a predetermined amount. When protruded, the spring 54
The other bends significantly downward, and its elasticity forces the connecting member 42 in a counterclockwise direction centering on the shaft 32 in FIG. As shown in FIG. 3, the strength of the elasticity of the spring 54 is set so that the head 12 swings in the counter-rotational direction of the hour hand, thereby lifting the head 12 a predetermined distance from the surface of the drawing board 2. The member 50 is rotated until the protrusion 50a abuts the stopper 82, and the other side of the spring 54 is attached to the upper portion 5 of the spring engaging portion 53 of the displacement body 52.
2b, that is, when the engagement position of the spring engaging portion 53 with the spring 54 is retracted upward, the upper portion 52b pushes up the spring 54, and the spring 54 moves upward as shown in FIG. 5b. , that is, in the opposite direction to that shown in FIG. 5C. Due to this deflection, the connecting member 42 is biased clockwise around the shaft 32 in FIG. 3, and the links 20 and 22 swing around the shaft 32 in the direction of rotation of the hour hand in FIG. Head 1
The upper portion 52 of the displacement body 52 is moved such that the upper portion 52 of the displacement body 52 is brought into close contact with the surface of the drawing board 2 by the downward elastic force of the spring 54.
The height of b is set. The rotation angle range of the member 50 is set to approximately 45 degrees in this embodiment.

In the above configuration, when the operator rotates the member 50 in the direction of rotation of the hour hand in FIG. 4 until the projection 50a is locked with the stopper 80 during drawing, the head 12 is moved by the upward elasticity of the spring 54. Therefore, it rises from the drawing board 2. In addition, the member 50 is shown in FIG.
When the protrusion 50a is rotated in the counterclockwise rotational direction until the protrusion 50a is stopped by the stopper 82, the head 12 is moved by the spring 5.
Due to the downward elasticity of 4, it comes into close contact with the two sides of the drawing board.
When a downward load is applied to the head 12 while the head 12 is floating above the drawing board, the head 12 descends against the pressure of the spring 54 due to this load. Then, if this load is released, the head 12
will rise.

Next, another embodiment will be described with reference to FIGS. 6 to 8.

Reference numeral 90 denotes a solenoid fixed to the connecting member 42, and is connected to a power source by a cord via a known sliding device and switch 92. The switch 92 is arranged on the handle 12a of the head 12. A spring 5 is attached to a spring engaging portion 90b consisting of a hole in a displacement body 90a consisting of a drive shaft of a solenoid 90.
The other end of 4 is fitted and engaged. solenoid 90,
The power source and switch 92 constitute a displacement body manual operation member. The other structure is the same as the embodiment shown in FIG.

When the switch 92 is turned to the ON side to energize the solenoid 90 in a state where the drawing board 2 is set horizontally to the floor surface, the spring engaging portion of the displacement body 90a projects downward. At this time, the amount of protrusion of the spring engaging portion 90b of the displacement body 90a with respect to the connecting member 42 is set to be the same as the amount of protrusion of the lower portion 52a of the spring engaging portion 53 of the displacement body 52 with respect to the connecting member 42 in the above embodiment. ing. When the displacement body 90a protrudes, as shown in FIG. 8C, the displacement body 90a
The weight of head 12 causes spring 54 to deflect downward. Due to the elasticity of the spring 54 applied to the displacement body 90a due to this deflection, the connecting member 42 is moved to the shaft body 3.
The head 12 swings in the counterclockwise direction of rotation of the hour hand in FIG. When the switch 92 is turned to the OFF side and the energization to the solenoid 90 is released, the displacement body 90a retreats due to the elasticity of a return spring (not shown) built into the solenoid 90, and the tip of the displacement body 90a moves back to the eighth position.
It rises as shown in Figure b. As the tip of the displacement body 90a rises, the spring 54 that engages with it via the spring engaging portion 90b is deflected upward, and this deflection causes the solenoid 90 to be pressed downward by the elasticity of the spring 54. As shown in FIG. 6, the connecting member 42 swings around the shaft 32 in the direction of rotation of the hour hand due to the downward elasticity of the spring 54, and the head 12 is moved to the second surface of the drawing board by the downward elasticity of the spring 54. In close contact. The position of the spring engaging portion 90b of the displacement body 90a with respect to the connecting member 42 when retracting is the upper portion 52b of the spring engaging portion 53 of the displacement body 52 in the above embodiment.
The position is set to be the same as the position relative to the connecting member 42. In addition, when implementing this proposal, please refer to links 20 and 2.
2, 56, and 60. The displacement bodies 52, 90a are attached to the support body 36, one end of the spring 54 is engaged with the spring engaging portion of the displacement bodies 52, 90a, and the other end of the spring 54 is connected and engaged with the connecting member 42. It's okay.

Since the present invention is constructed as described above, it is possible to reliably float and contact the head with respect to the drawing surface by operating the displacement body manual operation member, and also prevent the head from suddenly falling from the raised position. There are effects such as no excessive force being applied to the support mechanism.

[Brief explanation of drawings]

The drawings show preferred embodiments of the present invention, in which Fig. 1 is an overall plan view, Fig. 2 is a cross-sectional view, Fig. 3 is a longitudinal sectional view, Fig. 4 is a plan view, and Fig. 5 is an explanatory drawing. FIG. 6 is a longitudinal sectional view showing another embodiment, FIG. 7 is a plan view of the same,
FIG. 8 is an explanatory diagram of the same. 2... Drawing board, 4... X rail, 6... Y rail, 8... Y cursor, 10... Head elevating support device, 12... Head, 36... Support body, 42...
... Connection member, 50 ... Displacement body manual operation member, 52
...Displacement body, 53...Spring engaging portion, 54...Spring, 57...Screw hole, 80, 82...Stopper, 90a...Displacement body, 92...Switch.

Claims (1)

[Claims] 1. The head 12 is supported by a support 36 provided on the Y cursor 8 via a connecting member 42 so as to be able to move up and down with respect to the two surfaces of the drawing board, one of which engages with the support 36 and the other with the connecting member 42. The elastic force of the engaged spring 54 moves the connecting member 42 using the support body 36 as a fulcrum.
In a head lifting/lowering support device for a rail type universal parallel ruler, the head lifting/lowering support device has spring engaging portions 53, 90b.
When the engagement position with the spring 54 protrudes to a predetermined position, the spring 54 engages the spring engagement portions 53, 90.
b, the connecting member 42 is bent in the direction of rising with respect to the two surfaces of the drawing board, and the spring engaging portions 53, 9
When the engagement position with the spring 54 of 0b retreats to a predetermined position, the spring 54 engages the spring engagement portions 53, 90.
b, so that the connecting member 42 is bent in a downward direction relative to the two surfaces of the drawing board.
and a displacement body 52, 90a displaceably supported by one of the supports 36;
90a in the displacement direction and the spring engaging portions 53,
The displacement body 5 for moving the engagement position of the spring 54 of 90b in two directions, the protruding direction and the retreating direction.
2, 90a;